Import feature problem

When using the post import function, the values for the switch fields are not saved in the database (defined as 0 or 1 in the csv file).

Imported posts in the database have a NULL value for the switch fields.
Post type created with Builder. The database column type for the switch fields is Boolean.

How to make it work?

Internally Laravel casts the field to 1 or 0 when writing to the database. If the field is written as NULL, it suggests it is not imported correctly.

Add trace_sql() somewhere in your code to write every SQL statement to the system log. It might help.